(This document is just a draft and should be updated)

Travis build 
- id 1 is clang 6
- id 2 is clang 7

This is the script where the compiler is specified: 

[apps/ci/ci-before_install.sh](https://github.com/azerothcore/azerothcore-wotlk/blob/master/apps/ci/ci-before_install.sh)